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<h2><b>cos</b></h2><p> 

<code>cos(<i>expr</i>)</code><p> 

Takes the cosine of the <code><i>expr</i></code>. Values are assumed to be
in radians. Works on both gridded and station data. 
<H3>Usage Notes</H3><P>
<H3>Examples</H3><P>
